Beetle Jail entrance traps catch small hive beetles before they enter the hive and cause problems for your busy bees. With a 2″ deep molded polypropylene oil reservoir, you can use vegetable oil or diatomaceous earth for pest control. Since no chemicals are needed, this makes it that much more safer for your bees. Can be use with Langstroth, Top Bar, and Warre bee hives. Made with poplar wood, dipped in Wood Life Classic (a wood preservative and primer), and should be painted with a water based exterior paint before use.